In the 23-second clip, Ron tries to stop the theft, but the attacker lunges toward him with his bicycle and then says, “Old man, stay on the ground,” before he repeatedly kicks him all over his body.

“San Francisco police are investigating the matter as an assault. Ron said it’s the third time the same man harassed or tried to steal the sign in a week,” NBC’s Bay Area affiliate reported.

On March 19, the assailant attacked a pair of pro-life activists and also threw their sign and literature into the streets.

“The pro-lifer was taking part in a peaceful 40 Days for Life campaign when the perpetrator stole the victim’s banner and viciously beat him. The same assailant had attacked the victim and another man just two days prior,” the Life Legal Defense Foundation added.

“Life Legal represents the elderly victim, who is afraid for his safety. We are working closely with 40 Days for Life to make sure pro-life advocates in San Francisco and across the nation are protected and perpetrators are brought to justice.”